21354107 has 2 divisors, whose sum is σ = 21354108. Its totient is φ = 21354106.

The previous prime is 21354103. The next prime is 21354139. The reversal of 21354107 is 70145312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21354107 - 2² = 21354103 is a prime.

It is a super-3 number, since 3×21354107³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (21354103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10677053 + 10677054.

It is an arithmetic number, because the mean of its divisors is an integer number (10677054).

Almost surely, 2^21354107 is an apocalyptic number.

21354107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21354107 is an equidigital number, since it uses as much as digits as its factorization.

21354107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21354107 is about 4621.0504217115. The cubic root of 21354107 is about 277.4345033856.

Adding to 21354107 its reverse (70145312), we get a palindrome (91499419).

The spelling of 21354107 in words is "twenty-one million, three hundred fifty-four thousand, one hundred seven".